<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <button>press me</button>

    <script>
        const button = document.querySelector('button');
        button.onclick = function () {
            let name = prompt('what your name?');
            alert('hello ' + name + ' ,see you')
        }
    </script>
</body>
</html>